/*
(Ported from Arduino to Energia)

SoftwareSerial.h (formerly NewSoftSerial.h) - 
 Multi-instance software serial library for Arduino/Wiring
 -- Interrupt-driven receive and other improvements by ladyada
 (http://ladyada.net)
 -- Tuning, circular buffer, derivation from class Print/Stream,
 multi-instance support, porting to 8MHz processors,
 various optimizations, PROGMEM delay tables, inverse logic and 
 direct port writing by Mikal Hart (http://www.arduiniana.org)
 -- Pin change interrupt macros by Paul Stoffregen (http://www.pjrc.com)
 -- 20MHz processor support by Garrett Mace (http://www.macetech.com)
 -- ATmega1280/2560 support by Brett Hagman (http://www.roguerobotics.com/)
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 The latest version of this library can always be found at
 http://arduiniana.org.
 */

#ifndef SoftwareSerial_h
#define SoftwareSerial_h

#include <inttypes.h>
#include <Stream.h>

/******************************************************************************
 * Definitions
 ******************************************************************************/

#define _SS_MAX_RX_BUFF 16 // RX buffer size


class SoftwareSerial : public Stream {
private:
  // per object data
  uint8_t _receivePin;
  uint8_t _receiveBitMask;
  volatile uint8_t *_receivePortRegister;
  uint8_t _transmitBitMask;
  volatile uint8_t *_transmitPortRegister;

  uint16_t _rx_delay_centering;
  uint16_t _rx_delay_intrabit;
  uint16_t _rx_delay_stopbit;
  uint16_t _tx_delay;

uint16_t _buffer_overflow:
  1;
uint16_t _inverse_logic:
  1;

  // static data
  static char _receive_buffer[_SS_MAX_RX_BUFF]; 
  static volatile uint8_t _receive_buffer_tail;
  static volatile uint8_t _receive_buffer_head;
  static SoftwareSerial *active_object;

  // private methods
  void recv();
  uint8_t rx_pin_read();
  void tx_pin_write(uint8_t pin_state);
  void setTX(uint8_t transmitPin);
  void setRX(uint8_t receivePin);

  // private static method for timing
  static inline void tunedDelay(uint16_t delay);

public:
  // public methods
  SoftwareSerial(uint8_t receivePin, uint8_t transmitPin, bool inverse_logic = false);
  ~SoftwareSerial();
  void begin(long speed);
  bool listen();
  void end();
  bool isListening() { 
    return this == active_object; 
  }
  bool overflow() { 
    bool ret = _buffer_overflow; 
    _buffer_overflow = false; 
    return ret; 
  }
  int peek();

  virtual size_t write(uint8_t byte);
  virtual int read();
  virtual int available();
  virtual void flush();

  using Print::write;

  // public only for easy access by interrupt handlers
  static inline void handle_interrupt();
};

#endif

